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    JUnit

    JUnit : Calculator Test Case Example

    JUnit Tutorial, Most Visited

    Introduction

    In this post, we will look at a Simple Calculator Test case example for writing JUnit Tests. This tutorial helps beginners to understand writing and executing JUnit Tests.

    Manual Testcases for Standard Windows Calculator application can be found here:

    https://www.testingdocs.com/manual-test-cases-for-calculator-application/

    Calculator class

    The Calculator class is the class to be tested. The class contains mathematical methods like add, subtract, multiply, divide methods that need to be tested. We will write JUnit test methods to test the methods.

    Steps to create a Calculator Java class:  Create Calculator Java class

    Calculator User Story

    Sample User Story in Agile scrum story card format : 

    https://www.testingdocs.com/sample-calculator-user-story/

     Calculator Flowchart

    https://www.testingdocs.com/questions/calculator-raptor-flowchart/

    JUnit Test mechanism

    The @Test annotation methods test the Calculator object under test.

     

     

    Adding @Test methods in Eclipse IDE

    Steps to add test methods using Eclipse IDE:

    https://www.testingdocs.com/adding-calculator-test-methods-in-eclipse/

     

    AAA pattern

     

    Calculator Test Case

    The below example shows some basic sample JUnit test cases.

    package com.testingdocs.calculator.tests;

    //Arrange-Act-Assert pattern
    import com.testingdocs.calculator.Calculator;
    import org.junit.Test;
    import org.junit.Assert;
    import org.junit.Before;

    public class CalculatorTest {
    private Calculator objCalcUnderTest;

    @Before
    public void setUp() {
    //Arrange
    objCalcUnderTest = new Calculator();
    }

    @Test
    public void testAdd() {
    int a = 15; int b = 20;
    int expectedResult = 35;
    //Act
    long result = objCalcUnderTest.add(a, b);
    //Assert
    Assert.assertEquals(expectedResult, result);
    }

    @Test
    public void testSubtract() {
    int a = 25; int b = 20;
    int expectedResult = 5;
    long result = objCalcUnderTest.subtract(a, b);
    Assert.assertEquals(expectedResult, result);
    }

    @Test
    public void testMultiply() {
    int a = 10; int b = 25;
    long expectedResult = 250;
    long result = objCalcUnderTest.multiply(a, b);
    Assert.assertEquals(expectedResult, result);
    }

    @Test
    public void testDivide() {
    int a = 56; int b = 10;
    double expectedResult = 5.6;
    double result = objCalcUnderTest.divide(a, b);
    Assert.assertEquals(expectedResult, result,0.00005);
    }

    @Test(expected = IllegalArgumentException.class)
    public void testDivideByZero() {
    int a = 15; int b = 0;
    objCalcUnderTest.divide(a, b);
    }
    }

     

     

     

    Screenshot

     

    Calculator Test case 

    Right-click the JUnit test example class and run the test methods as “JUnit Test”. 

    In this example, we have placed Calculator class( the test class intended to be tested) in the same package as the test-case example class. However, this might not be the case while writing real tests. The application source code can be separated from test source code or automation code.

    Debug JUnit Tests

    When tests fail without valid defects in the application code, we may want to debug the tests. Learn how to debug a failing JUnit test in Eclipse.

    https://www.testingdocs.com/debugging-junit-tests-in-ide/

    Jenkins

    Running Calculator tests using Jenkins job. In real projects, the development team wants to run the tests automatically for every code change to the source code. Jenkins is a Continuous Integration (CI ) tool that does the job automatically. 

    https://www.testingdocs.com/running-calculator-junit-tests-using-jenkins/

    Using Command Line

    To run the tests from the command line: tests from command line.

    Bank Account Example

    Testing Bank Account Java class with JUnit 5:

    Sample Savings Account Junit Tests

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    ‹ Assumptions in JUnit Tests› Calculator Java class

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